Motor support



MOTOR SUPPORT Filed .April 13, 1942 rma:

51 11217117931" 5'. W .ilewari Patented Dec. 29, 1942 v Morbn sUProR'r'William H. Grinni ngenand harleswntewart Russell, Ky.; saiid-Stewart'assignor to said Application'pril 13, 1942; Serial 'No 4381846 r3 oaims; (oli 248" '-1`6) This invention relate'sto a 'dvice `for' usein connection with the' cut'ting and pla'cing of boiler tubes and more"particularly" for a* motor* 'support in connection with'such an'operation-.

`In'practice; boiler tubes are found to deterio- 'a Vide 'aconvenient'support for amotor; the shaft j of which'is connected bya'tlscop'ic `-p`ort`iori ard'universal' joint 'to the tool, rthemo't'o'r support itself being of an' improved constructidn 'by meansof'which themotoris fre'ely adjustabl and adapted to'cooperate"particularly-with the 4 expanding tool to' greatly"irn'prove`the efciency of that device. r

The"`invention" consists" iri `'the novel Construction,arra'nge'me`ntand'coinbiations of parts hereinafter more particularly described andclaimed.

One sheet of drawings accompanies this specification as part thereof, inwhich like reference characters indicate like parts throughout.

In the drawing:

Fig. 1 is a horizontal cross section through one end of a boiler showinga portion of the boiler tubes and the present invention applied andready for use.

Fig. 2 is a medial vertical cross section through the supporting device.

Fig. 3 is a transverse cross section taken on line 3-3 of Figure 2.

In the drawing I indicates the boiler head at one end of a boiler, 2 theheader plate and 3 the ends of the boiler tubes.

As hereinbefore indicated, the boiler tubes 3 are found to firstdeteriorate adjacent the points where they are secured in the headerplate 2 and to repair the same it is customary. to cut the tubes justbeyond the worn portion'which permits the tube being driven out throughthe other end of the boiler, the tubes being usually held in position byexpanded portions Bo just within each of the boiler headers 2. In makingsuch repairs to boiler tubes it has been heretofore the practice' tocutthe tubes with a hand cutter tool aid'after thnew portion of tube haste'h weldd' on; to replace the* worn portion *and tube replaced to us"ea ri eipaner to again' expand the tube in position; i v I This 'work'has been done through' the boiler head by removing th usualcov'i'scured'to'the boile'r hanger; v i

-In accordancewith the p're sexit`invtion` after theboil'er cover' hasbeen' removed'a' tub 5` is secured hdrizontallj in'p'oition and for thispurpose the' tube' 5 is' convniritly flatterd at one end, as at 'B', an.provided with ag holethroug'h which a' bolt" 'I Caribe passed andthreaded into one' 'of the holes' of the boiler fla'r`1g' l".` 'Topermit the use of" the same' tube with a"'va`rie'ty of bolers, the otherend of the tube is preferably secured to'the" o'pposite side o'f the'fiang'eby a sadd1e` clip-'8`adapted 'to seat' over the .end of 'thetube and be secured to the' fia'nge as by a bolt' 9'. Slidablypositioned on the tube-5 is a motor supporting carrage; which isindicated'ge''erally at lo'and formedfrom' a rod of suitable'metal il5'be'nt up'n`its'elf to for'ni parallel 1egs`j lB-'-`l6, which lgs 'arein turn bent upon themselves: as at'` I'l', to' extend undr and parallelwith the legs' HE; as at [83 and bn't at' their e'n'dsinto eyes" l 9adapted to'receive the" tibe 5.

A plat'w "is providedon its' lower' face with parallel tubularguid 2I-"2 I which' are slidably positioned upon the parallel legs 'I 6-! 5thus permitting slidable motion of the plate upon those legs. Bolts 2l'positioned in holes in the tubular guides 2! permit the securing ofplate 20 rigidly with respect to leg !6 when desired. The plate 20 isalso provided with a transverse, downwardly directed fiange 22 and thebends I1 of legs IG- 3 are connected by a transverse member 23. A spiralspring 24 connectsthe bridging member 23 with the transverse fiange 22thus normally pulling plate 20 towards the rear of the supportingdevice.

A second plate 25 is rotatably mounted on plate 20, being pivotallysecured thereto as by a central rivet 21. The plate 25 is provided withoppositely disposed arcuate Slots 26-26 and the two plates 20 and 25 arefurther secured by rivets 28 extending through said arcuate slots ofplate 25 and secured to plate 20 thereby aording limited rotary motionof plate 25 with respect to plate 20. On plate 25 is an upwardlyextending flange 29 provided with a hole 30 through which a handle ofmotor I l can be passed. A bracket 3! spaced from fiange 29 is adaptedto support the power supply tube 34 of motor H, the latter being clampedin position, as by a saddle strap 32 and bolts 33. The drawing hereinillustrates a compressed air motor but obviously the invention is notrestricted to any particular type of motor. As illustrated, the tube 34Supplies compressed air to motor l l and the supply of the compressedair is controlled by a rotary hand-grasp valve 35.

The shaft of the motor is provided with a telescopic extension !2 whichcarries a universal joint !3 which can be connected to a suitable toolas desired, the drawing herein illustrating an expander tool forexpanding the boiler tubes.

These tube expanders are well known in the art and are illustrated inmany patents, such as No. 1,467,238, and are generally characterized ascomprising a conical spindle carrying ahead 50 provided withcircumferentially spaced rollers 5l and other feed rollers 52, thelatter having their axes angularly disposed with respect to the axis ofthe spindle. By reason of the Construction and arrangement of therollers on these devices, their rotation in one direction causes theexpander rollers to move outwardly within the tube and thus expand theadjacent portion of the tube while their rotation in the oppositedirection forces the rollers inwardly and thus permits the withdrawal ofthe tool from the expanded tube. From a consideration of the motorcarriage as hereinbefore described and by reference to Fig. 1 it will beapparent that with the motor mounted as described on this carriage, itWill be freely slidable transversely of the boiler head on rod 5 andalso rotatable on rod 5. Further, the motor will be rotatable in ahorizontal axis by reason of the rotation of plate 25 on plate 20 sothat with the carriage once mounted on the boiler head,

the operator can apply the tool to any of the many boiler tubes and ifnecessary to all of the boiler tubes in succession without changing themounting of the motor.

When the tube expander is being used it will be noted that for thegreater part of the tubes the improved motor carriage will functionallycooperate with the tube expander to automatically withdraw the too-1from the tube. With all of the tubes except that which may be in directalignment with the shafts of both the motor and the tool, it will befound that when the tool l4 is positioned parallel with the axis of thetube it will be angularly disposed to the axis of the motor shaft sothat any motion of the tool on the line of its own axis will effectivelylock the telescopic joint |2 by reason of side friction so that theforcing of the expander tool !4 inwardly to expand the rollers will drawthe plate 20 forwardly against the tension of spiral springs 24.Conversely, when the rotation of expander tool [4 is reversed to permitthe withdrawal of the expander rollers, the springs 24 will force thecarriage plate 20 back and thus automatically withdr-aw the expandertool from the tube. In the case of a tube directly in alignment with theaxes of ;both the motor shaft and tool M, therelwill, of course, be nosuch automatic withdrawal of the expander tool because in that angularposition the telescopic joint will prevent tensioning of springs 24. v

various modification will suggest themselves to those skilled in the artbut within the scope of the present invention as claimed.

Having described our invention, We claim:

1. A motor support for boiler tube tools, comprising a supporting rod, aframe device slidable and rotatable on the rod, a plate slidable on theframe, a second plate rotatable on the first plate, and' means carriedby the second plate for securing a motor thereon.

2. A motor support for boiler tube tools, comprising a supporting rod, aframe device slidable and rotatable on the rod, a plate slidable on theframe, spring means arranged to retract the plate to one end of theframe, a second plate rotatably mounted on the first plate, and meanscarried by the second plate for securing a motor thereon.

3. A motor support for boiler tube tools, comprising a supporting rod, aframeconsisting of a rod bent upon itself into U shape having the legsbent back in paralle relationship and formed into eyes adapted toreceive the supporting rod, the legs of said frame connected by atransverse bridge member, a plate slidable on the legs of the framemember, spring means connecting the slidable plate with the transversebridge member, a second plate rotatably mounted on the slidable a plateand means carried by the rotatable plate for mounting a motor thereon.i.

WILLIAM H. GRINNINGER. CHARLES W. STEWART.

